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Method and system for preparing electrode plate by dry process, and application

A technology for preparing electrodes and dry method, which is applied in the field of electrode sheet preparation by dry method, can solve the problems that the structure of electrode active materials is easily destroyed, and the electrochemical performance of batteries or supercapacitors decreases, so as to facilitate film formation by rolling and improve fiber effects and reduce adverse effects

Pending Publication Date: 2021-11-19
SVOLT ENERGY TECHNOLOGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For this reason, an object of the present invention is to propose the method, system and application of dry preparation electrode sheet, to solve the structure of electrode active material to be easily destroyed and the electrochemical performance of battery or super capacitor that then causes when dry method preparation electrode sheet falling problem

Method used

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  • Method and system for preparing electrode plate by dry process, and application
  • Method and system for preparing electrode plate by dry process, and application
  • Method and system for preparing electrode plate by dry process, and application

Examples

Experimental program
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Effect test

Embodiment 1

[0082] (1) Mix the electrode active material, conductive agent, and dry binder using a mixing device to obtain a mixture, wherein the electrode active substance is an NCM523 positive material, the conductive agent is SP (super carbon black), dry binder For PTFE, the mass ratio of the three is 97: 1: 2;

[0083] (2) The mixture is kneaded by a kneading apparatus having a pair of σ-shaped rotary blades arranged in combination with each other, and the dry binder is preliminary, and the pre-fibrotic product, two blades The rotational speed is 42 rpm, respectively, and 28 rpm.

[0084] (3) The preframe was crushed by a crusher to obtain a particulate material, in which the rotational speed of the crusher was 500 rpm, and the particulate material was sieved using an 8 mesh screen, and the material was collected under the screen.

[0085](4) a horizontal heating roll press material after sieving is hot-pressed at 100 ℃, to give the primary pole pieces of the film; using a three-roll sets...

Embodiment 2

[0087] Example 1 in that the difference between: the step (2) is further added to the organic additives heterogeneous hexadecane (trade name Isopar M), the proportion of the organic additives in the mixture is 8wt%. Step (4) of a horizontal heat roll press material after sieving is hot-pressed at 100 ℃, to give the primary pole pieces of the film; using a three-roll sets of successive vertical roll press heated at 120 ℃ primary 3 batches pole piece film is heat accumulated nine roll forming, to obtain a film having a thickness of 80μm of the pole piece; positive electrode sheet membrane compaction density of 2.9g / cm 3 . 150 ℃ blast drying 4h, after removal of the auxiliary Isopar M, and using the film thickness of the pole pieces COATED vertical roll press heated at 120 deg.] C as 17μm sided aluminum foil current collector, the layer thickness of 2μm trampled hot pressed composite, to give sided pole piece, the pole piece thickness 159μm, pole piece tap density 3.3g / cm 3 .

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Abstract

The invention discloses a method and a system for preparing an electrode plate by a dry process, and application. The method comprises the following steps: mixing an electrode active material, a conductive agent and a dry binder to obtain a mixture; carrying out kneading treatment on the mixture through mechanical extrusion so as to carry out preliminary fibration on the dry-method binder to obtain a blocky and / or flocculent pre-fibration product; carrying out crushing treatment on the pre-fibration product so as to obtain a granular material; and carrying out roll forming on the granular material and the current collector so as to form a pole piece film on the surface of the current collector, thereby obtaining the dry electrode plate. The method is simple and feasible, required equipment is simple, the problem that the electrode active material structure is damaged in the material crushing treatment process can be effectively solved, the production efficiency is higher, amplification is easy, the method is more suitable for large-scale mass production of the dry electrode technology, development of the new energy industry is promoted, and the method has wide application prospects.

Description

Technical field [0001] The present invention belongs to the field of lithium batteries, and in particular, the method, system, and application of dry manufacturer electrode sheets are related to drying. Background technique [0002] The lithium-ion battery and the hypercapacitor can be divided into a wet process and a dry process in accordance with whether or not the solvent is used. The difference in dry electrode sheet and wet battery pole is mainly concentrated in the preparation of the electrode sheet, and a large amount of solvent prepared is a wet electrode by coating a large amount of solvent prepared. Compared, any solvent is not used or only a small amount of auxiliary agent is added, and the binder fibrosis is bonded to the dry electrode sheet by the roller roller. The wet process is currently the most common coating process, and the electrode active substance, conductive agent, and binder are prepared into a battery slurry. In order to ensure the fluidity of the batter...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/04H01M4/139H01G11/86
CPCH01M4/0435H01M4/139H01G11/86Y02E60/10
Inventor 张耀法秦士林肖强马忠龙
Owner SVOLT ENERGY TECHNOLOGY CO LTD
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